{"id":2931,"date":"2021-03-22T17:04:58","date_gmt":"2021-03-22T16:04:58","guid":{"rendered":"https:\/\/andreas-klingler.de\/infosec\/?p=2931"},"modified":"2023-12-24T12:39:15","modified_gmt":"2023-12-24T11:39:15","slug":"openssl","status":"publish","type":"post","link":"https:\/\/infosec.andreas-klingler.de\/?p=2931","title":{"rendered":"openssl"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Exam\u00adple of a connection:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">openssl s_client -connect $target:995 -crlf -quiet<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Issues<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The fol\u00adlow\u00ading mes\u00adsage means that the serv\u00ader and client could not agree on a shared cryp\u00adto sys\u00adtem; prob\u00ada\u00adbly because the server\u2019s cryp\u00adto is too&nbsp;old.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">139763095926080:error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol:..\/ssl\/statem\/statem_lib.c:1957:<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Add <span class=\"caps\">TLS<\/span> 1 support:<\/p>\n\n\n\n<pre id=\"block-bca291a6-ac68-45c7-8889-173b2a38fa24\" class=\"wp-block-preformatted\">openssl s_client -connect $target:995 -crlf -quiet <strong>-tls1<\/strong><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exam\u00adple of a con\u00adnec\u00adtion: openssl s_client \u2011con\u00adnect $target:995 \u2011crlf \u2011qui\u00adet Issues The fol\u00adlow\u00ading mes\u00adsage means that the serv\u00ader and client could not agree on a shared cryp\u00adto sys\u00adtem; prob\u00ada\u00adbly because the server\u2019s cryp\u00adto is too&nbsp;old. 139763095926080:error:<span class=\"caps\">1425F102<\/span>:<span class=\"caps\">SSL<\/span> routines:ssl_choose_client_version:unsupported protocol:..\/ssl\/statem\/statem_lib.c:1957: Add <span class=\"caps\">TLS<\/span> 1 sup\u00adport: openssl s_client \u2011con\u00adnect $target:995 \u2011crlf \u2011qui\u00adet \u2011tls1<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[477],"tags":[367],"class_list":["post-2931","post","type-post","status-publish","format-standard","hentry","category-software","tag-openssl"],"_links":{"self":[{"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/posts\/2931","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2931"}],"version-history":[{"count":1,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/posts\/2931\/revisions"}],"predecessor-version":[{"id":2932,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=\/wp\/v2\/posts\/2931\/revisions\/2932"}],"wp:attachment":[{"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/infosec.andreas-klingler.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}